Power tool
AssigneeMakita Corporation
InventorsShinji Onoda, Takahiro Nishikawa
Life of this patent
Estimating the term…
Abstract
A power tool efficiently cools a motor and a brush, with a distance for insulation left between an inlet and an urging member. A power tool includes a motor, an output unit, a fan, a housing accommodating the motor and the output unit, having an inlet to suck in air from outside in response to rotation of the fan and an outlet to discharge the air sucked in, and accommodating the motor along a flow of the air between the inlet and the outlet, a brush retainer downstream from the inlet and including a brush and a conductive urging member urging the brush against a commutator, and a nonconductive cover located between the urging member and the inlet and covering the urging member.
Claims15
A power tool, comprising:
- a motor including
- a stator, and
- a rotor including a commutator and a rotational shaft;
- an output unit drivable by the motor;
- a fan located on the rotational shaft;
- a housing accommodating the motor and the output unit, the housing having an inlet to suck in air from outside in response to rotation of the fan and an outlet to discharge the air sucked in, the housing accommodating the motor along a flow of the air between the inlet and the outlet;
- a brush retainer downstream from the inlet, the brush retainer including
- a brush in contact with the commutator, and
- an urging member being conductive and urging the brush against the commutator;
- and
- a cover being nonconductive and detachably attached to the housing, the cover being located between the urging member and the inlet and covering the urging member
- wherein the housing includes
- a first housing, and
- a second housing joined to the first housing,
- the cover is located in the first housing, and
- the inlet is located on the second housing.
A power tool, comprising:
- a motor including
- a stator, and
- a rotor including a commutator and a rotational shaft;
- an output unit drivable by the motor;
- a fan located on the rotational shaft;
- a housing accommodating the motor and the output unit, the housing having an inlet to suck in air from outside in response to rotation of the fan and an outlet to discharge the air sucked in, the housing accommodating the motor along a flow of the air between the inlet and the outlet;
- a brush retainer downstream from the inlet, the brush retainer including
- a brush in contact with the commutator, and
- an urging member being conductive and urging the brush against the commutator;
- and
- a cover being nonconductive and detachably attached to the housing, the cover being located between the urging member and the inlet and covering the urging member,
- wherein the brush retainer is rotatable about the commutator to switch a position of the brush relative to the commutator between a forward rotational position to rotate the rotor forward and a reverse rotational position to rotate the rotor backward, and
- the cover covers an area in which the urging member is movable in response to rotation of the brush retainer.
A power tool, comprising:
- a motor including
- a stator, and
- a rotor including a commutator and a rotational shaft;
- an output unit drivable by the motor;
- a fan located on the rotational shaft;
- a housing accommodating the motor and the output unit, the housing having an inlet to suck in air from outside in response to rotation of the fan and an outlet to discharge the air sucked in, the housing accommodating the motor along a flow of the air between the inlet and the outlet;
- a brush retainer downstream from the inlet, the brush retainer including
- a brush in contact with the commutator, and
- an urging member being conductive and urging the brush against the commutator;
- a cover being nonconductive and detachably attached to the housing, the cover being located between the urging member and the inlet and covering the urging member, and
- a wire holder detachably attached to the housing, the wire holder holding a wire extending from the motor,
- wherein the cover is located in the wire holder.
Dependencies are inferred from the claim text.